std.conv.parse for user defined structs/objects

[H. S. Teoh]

On Fri, Dec 27, 2013 at 07:38:59PM +0000, Ilya Yaroshenko wrote:
> Hello!
> 
> Can we introduce std.conv.parse for user defined structs/classes?
> 
> I think we can define inner static method:
> 
> -----------
> struct UserStruct
> {
>     static typeof(this) parseImpl(Range)(Range range)
>     if(...)
>     {
>         typeof(this) ret;
>         ...
>         return ret;
>     }
> }
> -----------
> or something like that.

I've been thinking about this too. It shouldn't be too hard to add this
to std.conv (I'd call it "fromString", though, by analogy with
"toString" -- "parseImpl" looks a bit ugly).


> And then use it in standard parse function.
> 
> The reason is common parse, formattedRead and io/stdio.readf
> functions that can be used for user defined types (and for voldemort
> user defined types too!).
> 
> 
> If DIP is preferred in this case, please tell me about.
[...]

I generally support this idea, though it might be a good idea to discuss
the exact design here first.


T

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